Une fonction beaucoup plus à jour pour ajouter du contenu à un textarea

prive/javascript/spip_barre.js

 // Barre de raccourcis
-
-function barre_inserer(text,champ) {
-	var txtarea = champ;
-	if( document.selection ){
-		txtarea.focus();
-		var r = document.selection.createRange();
-		if (r == null) {
-			txtarea.selectionStart = txtarea.value.length;
-			txtarea.selectionEnd = txtarea.selectionStart;
-		}
-		else {
-			var re = txtarea.createTextRange();
-			var rc = re.duplicate();
-			re.moveToBookmark(r.getBookmark());
-			rc.setEndPoint('EndToStart', re);
-			txtarea.selectionStart = rc.text.length;
-			txtarea.selectionEnd = rc.text.length + r.text.length;
-		}
-	} 
-	mozWrap(txtarea, '', text);
-}
-
-
-function setSelectionRange(input, selectionStart, selectionEnd) {
-  if (input.setSelectionRange) {
-    input.focus();
-    input.setSelectionRange(selectionStart, selectionEnd);
-  }
-  else if (input.createTextRange) {
-    var range = input.createTextRange();
-    range.collapse(true);
-    range.moveEnd('character', selectionEnd);
-    range.moveStart('character', selectionStart);
-    range.select();
-  }
-}
-
-// From http://www.massless.org/mozedit/
-function mozWrap(txtarea, open, close)
-{
-	var selLength = txtarea.textLength;
-	var selStart = txtarea.selectionStart;
-	var selEnd = txtarea.selectionEnd;
-	if (selEnd == 1 || selEnd == 2)
-		selEnd = selLength;
-	var selTop = txtarea.scrollTop;
-
-	// Raccourcir la selection par double-clic si dernier caractere est espace	
-	if (selEnd - selStart > 0 && (txtarea.value).substring(selEnd-1,selEnd) == ' ') selEnd = selEnd-1;
-	
-	var s1 = (txtarea.value).substring(0,selStart);
-	var s2 = (txtarea.value).substring(selStart, selEnd)
-	var s3 = (txtarea.value).substring(selEnd, selLength);
-
-	// Eviter melange bold-italic-intertitre
-	if ((txtarea.value).substring(selEnd,selEnd+1) == '}' && close.substring(0,1) == "}") close = close + " ";
-	if ((txtarea.value).substring(selEnd-1,selEnd) == '}' && close.substring(0,1) == "}") close = " " + close;
-	if ((txtarea.value).substring(selStart-1,selStart) == '{' && open.substring(0,1) == "{") open = " " + open;
-	if ((txtarea.value).substring(selStart,selStart+1) == '{' && open.substring(0,1) == "{") open = open + " ";
-
-	txtarea.value = s1 + open + s2 + close + s3;
-	selDeb = selStart + open.length;
-	selFin = selEnd + close.length;
-	window.setSelectionRange(txtarea, selDeb, selFin);
-	txtarea.scrollTop = selTop;
-	txtarea.focus();
-	
-	return;
-}
-
+function barre_inserer(text, el = document.activeElement) {
+	const [start, end] = [el.selectionStart, el.selectionEnd];
+	// remplace la sélection (ou curseur) par le contenu demandé
+	el.setRangeText(text, start, end, 'select');
+	// place le curseur à la fin (désélectionne)
+	const new_caret_pos = start + text.length;
+	el.setSelectionRange(new_caret_pos, new_caret_pos);
+	el.focus();
+	// trigger une saisie clavier
+	el.dispatchEvent(new Event('input'));
+}
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